National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Sparta, Sparta / Fort McCoy Airport (KCMY)

Lat: 43.96°NLon: 90.74°WElev: 837ft.

Fair

23°F

-5°C

Humidity 94%
Wind Speed Calm
Barometer 29.71 in (1007.2 mb)
Dewpoint 22°F (-6°C)
Visibility 8.00 mi
Last update 8 Jan 2:55 am CST
Extended Forecast for

3 Miles ENE Ontario WI

  • Overnight

    Overnight: Patchy fog. Otherwise, partly cloudy, with a low around 31. South wind around 5 mph.

    Low: 31 °F

    Patchy Fog

  • Thursday

    Thursday: Rain, mainly after 3pm. High near 43. South wind around 5 mph becoming calm. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 43 °F

    Partly Sunny
    then Rain

  • Thursday Night

    Thursday Night: Rain before 2am, then rain and snow between 2am and 4am, then a chance of snow after 4am. Low around 32. North wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.

    Low: 32 °F

    Rain then
    Rain/Snow

  • Friday

    Friday: A chance of rain and snow before 11am, then a chance of snow between 11am and noon. Cloudy, then gradually becoming mostly sunny, with a high near 38. North wind 5 to 10 mph becoming light northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 30%.

    High: 38 °F

    Chance
    Rain/Snow
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 24. Light and variable wind.

    Low: 24 °F

    Mostly Cloudy

  • Saturday

    Saturday: Snow likely. Mostly cloudy, with a high near 30. Light northwest wind increasing to 9 to 14 mph in the morning. Winds could gust as high as 23 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 3 inches possible.

    High: 30 °F

    Snow Likely

  • Saturday Night

    Saturday Night: A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 17. Northwest wind 11 to 14 mph, with gusts as high as 23 mph.

    Low: 17 °F

    Chance Snow

  • Sunday

    Sunday: Mostly sunny, with a high near 27. Northwest wind 6 to 10 mph, with gusts as high as 21 mph.

    High: 27 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 17. Southwest wind 6 to 8 mph.

    Low: 17 °F

    Partly Cloudy

Detailed Forecast

Overnight
Patchy fog. Otherwise, partly cloudy, with a low around 31. South wind around 5 mph.
Thursday
Rain, mainly after 3pm. High near 43. South wind around 5 mph becoming calm. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Rain before 2am, then rain and snow between 2am and 4am, then a chance of snow after 4am. Low around 32. North wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.
Friday
A chance of rain and snow before 11am, then a chance of snow between 11am and noon. Cloudy, then gradually becoming mostly sunny, with a high near 38. North wind 5 to 10 mph becoming light northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 30%.
Friday Night
Mostly cloudy, with a low around 24. Light and variable wind.
Saturday
Snow likely. Mostly cloudy, with a high near 30. Light northwest wind increasing to 9 to 14 mph in the morning. Winds could gust as high as 23 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 3 inches possible.
Saturday Night
A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 17. Northwest wind 11 to 14 mph, with gusts as high as 23 mph.
Sunday
Mostly sunny, with a high near 27. Northwest wind 6 to 10 mph, with gusts as high as 21 mph.
Sunday Night
Partly cloudy, with a low around 17. Southwest wind 6 to 8 mph.
Monday
Mostly sunny, with a high near 38. West wind 7 to 9 mph.
Monday Night
Mostly cloudy, with a low around 28. West wind 6 to 8 mph.
Tuesday
A chance of rain and snow. Mostly cloudy, with a high near 38. Southwest wind 6 to 8 mph. Chance of precipitation is 30%.
Tuesday Night
A chance of rain and snow. Mostly cloudy, with a low around 24. Northwest wind around 7 mph. Chance of precipitation is 30%.
Wednesday
A 20 percent chance of snow. Mostly cloudy, with a high near 29. North wind 7 to 9 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ENE Ontario WI
 43.73°N 90.55°W
Last Update:
3:11 am CST Jan 8, 2026
Forecast Valid:
3am CST Jan 8, 2026-6pm CST Jan 14, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation